
    <nz-tree
      [nzData]="nodes"
      nzCheckable="true"
      nzMultiple="true"
      [nzCheckedKeys]="defaultCheckedKeys"
      [nzExpandedKeys]="defaultExpandedKeys"
      [nzSelectedKeys]="defaultSelectedKeys"
      (nzClick)="nzEvent($event)"
      (nzExpandChange)="nzEvent($event)"
      (nzCheckBoxChange)="nzEvent($event)">
    </nz-tree>
  